It would seem based on this article wizards.com/dnd/Article.aspx?x=dnd/drdd/20110615 (and a few things in dragon which I can't read) The entire land seems to be missing a name, with the lands just having the names of the empires that conquered it. If names were given to the general territory, its beyond my reach :)
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GMNoobAug 21 '11 at 9:20

I would put a bounty on this just for the heck of it, but I get the feeling that the answer at this point may well be "It hasn't been named yet", and that wouldn't be much fun. Perhaps we'll know after a few more product releases.
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JakobAug 23 '11 at 13:50